Puzzle.



H. 0. DAVIDSON.

PUZZLE. APPLICATION rum) JAN. 3, 1910.

Patnted May 30, 1911.

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H. G. DAVIDSON. PUZZLE.

APPLIOATION IILED JANA, 1910. 993,581 Patented May 30, 1911.

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HARRY G. DAVIDSON, OF NEW YORK, N. Y.

PUZZLE.

Specification of Letters Patent.

Patented May 30, 1911.

Application filed January 3, 1910. Serial No. 536,150.

To all whom it may concern:

I Be it known that I, HARRY C. DAVIDSON,

a citizen of the United States, and a resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Puzzles, of which the following is a specification.

My invention relates to improvements in puzzles and more especially to that class of puzzles which exercise the mental faculties in addition and subtraction and which are especially efiieient in holding interest and attention and are considerably more difficult than prior puzzles of this class.

Various important features and details of my invention will more clearly appear from the detailed description given below taken in connection with the accompanying drawings which form a part of this specification.

The drawings show one preferred form of my puzzle and as shown this consists of four disks, of which Figure 1 is a plan view of the bottom disk. Fig. 2 is a plan view of the disk lying on top of the same. Fig. 3 is a plan view of the disk lying on top of the disk shown in Fig. 2. Fig. 4 is a plan view of the disk lying on top of the disk shown in Fig. 3. Fig. 5 is a plan View of the puzzle with the disks of Figs. 1, 2, 3 and 4, assembled, with the disks properly positioned. Fig. 6 is a plan view similar to Fig. 5, with the disks differently arranged. Fig. 7 is a cross section of the parts shown in Fig. 6.

Referring to Fig. 1, 1 represents the bottom disk provided with two sets of numbers 2 and 3 arranged at its periphery. The

7 numbers of these sets are arranged in radial columns bounded by the dividing lines 4.

. The disk 5 shown in Fig. 2 is smaller than the disk 1 and is provided with a similar set of numbers 6 arranged on a circular line at the periphery of the same. These numbers are so spaced that when the disk 5 is placed upon the disk 1 and properly positioned thereon, the numbers will form parts or continuations of the radial columns of the disk 1. Projecting from the edge of the disk 5 is a plurality of tabs 7 each tab being provided with a number thereon which may be arranged in or may complete one of said columns. The tabs 7 are arranged opposite every other one of the radial columns when the disk 5 is placed upon the disk 1 and properly positioned thereon. When the disk 5 is properly positioned upon the disk 1 the tabs 7 will cover up every other one of the numbers in the curved row 3.

The disk 8 shown in Fig. 3 is similar to the disk 5 of Fig. 2 but is smaller than the same and is arranged to be placed concentrically thereto. The disk 8 is provided with tabs 9 projecting from the edges thereof, each of which is provided with a suitable number and which tabs are designed to cover up every other one of the numbers of the row 6 upon the disk 5 when properly positioned thereon, the numbers on the tabs filling the spaces made by the tabs when they cover up numbers below and thus completing the columns.

The disk 10 shown in Fig. 4 is not pro vided with a row of numbers at its periphery but is provided with a series of tabs 11, each provided with a suitable number thereon and which tabs are designed to cover up every other one of the numbers in the row 12 at the periphery of the disk 8.

The disks 1, 5, 8 and 10 are assembled as shown in Fig. 7 and are mounted to coaxially rotate with respect to one another upon a pivotal pin or eyelet13. Suitable spacing members or washers 14 may be placed between the various disks.

A plan view of the various disks or plates assembled is shown in Fig. 5, in which the numbers of the various rows and on the tabs are so positioned and the various plates so adjusted that each radial column of numbers will add up to 40. By rotating the various disks 1, 5, 8 and 10 in irregular manner with respect to one another we obtain the arrangement shown in Fig. 6.

The operation and purpose of the puzzle is to take the arrangement as shown in Fig. 6 and so rotatethe various disks or plates with respect to one another that each of the radial columns will add up to 40. The puzzle is made all the more diilicult and interesting by the provision of the tabs 7, 9 and 11 which extend from the tabs of the disks and cover up part of the numbers in the circular rows on the disks below. If desired the bottom disk 1 may be provided with tabs similar to those on the other disk and the upper disk 10 may be provided with a row of numbers extending around its periphery within the tabs 11.. These changes would only make the puzzle still more diflicult.

Although I have described my improvements in great detail nevertheless I do not desire to be limited thereto except as specified hereinafter in the claims, since many modifications and changes may be made without departing from the spirit and scope of my invention. But

Having thus fully and clearly described my improvements what I claim as new and desire to secure by Letters Patent, is:

1. The combination of a plurality of coaxially rotatable disks of difierent sizes, each provided with numbers arranged at its periphery, said numbers being so spaced apart that when the disks are properly positioned the numbers thereon will form a series of radial columns, tabs on said disks projecting radially opposite every other one of said 001- umns and numbers on said tabs arranged to form part of said columns.

2. The combination of a plurality of coaxially rotatable disks of different sizes, some of said disks being provided with numbers arranged at their peripheries, said numbers being so spaced apart that when the disks are properly positioned the numbers thereon will form a series of radial columns, some of said disks being provided with tabs projecting over every other column, each tab covering up one of the numbers on the disks below it, and numbers on said tabs.

3. The combination of four coaxially pivoted disks of different sizes, one above another, arranged in the order of their sizes, the smaller on top, each of the three lower disks being provided with numbers at its periphery, said numbers being so spaced apart that when the disks are properly positioned the numbers thereon will form a series of radial columns, tabs on each of the three upper disksprojecting from the edges thereof and over numbers in every other column on the disk below and numbers on said tabs to complete the columns and cause every column to add up to the same number when the disks are properly positioned.

4. The combination of a plurality of-coaxially rotatable disks of different sizes, arranged one above another with the smaller on top, some of said disks being provided with numbers at their peripheries, said numbers being so spaced apart that when the disks are properly positioned the numbers thereon will form a series of radial columns some of said disks being provided with tabs, each tab projecting over a number in the column on the disk below and numbers on said tabs arranged in said columns.

5. The combination of a plurality of relatively rotatably mounted plat-es, some of said plates being provided with numbers arranged thereon on a curved line, said numbers being so spaced apart that when the plates are properly positioned the numbers thereon will form a series of columns, some of said plates being provided with tabs, each tab projecting over a number in the column on the plate below, and numbers on said tabs for completing said columns.

6. The combination of a plurality of relatively rotatably mounted plates, some of said plates being provided with numbers arranged thereon on a curved line, said numbers being so spaced apart that when the plates are properly positioned the numbers thereon will form a series of columns,

one of said plates being provided with tabs,-

each tab projecting over a number in the column on the plate below, leaving the remaining numbers on the plate below visible, and numbers on said tabs for completing said columns.

7. The combination of two plates relatively rotatably mounted, said plates being provided with numbers arranged thereon on a circular line, said numbers being so spaced apart that when the plates are properly positioned the numbers thereon will form a series of columns, and a third plate mounted to rotate relatively to the other two, said third plate being provided with tabs projecting from the edge thereof, each tab extending over a number on the plate below and numbers on-said tabs for completing said columns. I

8. The combination of two relatively rotatably mounted plates, one above the other, the lower plate being provided with two sets of numbers thereon to form columns, each set being arranged on a curved line one within the other, and the upper plate being provided with tabs projecting from its edge,:

each tab extending over and covering one of the numbers on the plate below,and numbers on said tabs arranged to complete said columns.

9. The combination of two relatively rotatably mounted plates, one above the other, the lower plate being provided with two sets of numbers thereon, each set being 91- ranged on a curved line one within the other, and the upper plate being provided with tabs projecting from its edge, each tab extending over and covering one of the numbers on the plate below. I

10. The combination of two relatively'rotatably mounted plates, one above the other,

the lower plate being provided with two sets of'numbers thereon to form columns, each set being arranged on a curved line one within the other, and the upper plate being provided with tabs projecting from its edge, and numbers on said tabs arranged to complete said columns.

11. The combination of three relatively rotatable plates, one above another, each be ing provided with numbers thereon arranged a circular line, said numbers being so spaced their edges, said tabs being arranged to cover up some of the numbers on the disk below.

Signed at New York in the county of New 15 York and State of New York this 31st day of December A. D. 1909.

HARRY G. DAVIDSON.

in a circular line, said numbers being so spaced as to form columns and one of said plates being provided with means for covering up some of the numbers on the disk below.

12. The combination of three relatively rotatable plates, one above a another, each provided with numbers thereon arranged in Witnesses:

GoRHAM CROSBY,

as to form columns, and two of said plates EDWIN SEGER.

being provided with tabs extending from five cents each, by addressing the "Commissioner of Iatents,

Copies of this patent may be obtained for Washington, D. G." 

